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[WebKit checkers] Treat std::bit_cast as a pointer conversion #137476

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Merged
merged 2 commits into from
May 1, 2025
Merged

[WebKit checkers] Treat std::bit_cast as a pointer conversion #137476

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c76e861
[WebKit checkers] Treat std::bit_cast as a pointer conversion
rniwa Apr 26, 2025
49f3566
Also fix TrivialFunctionAnalysisVisitor to recognize std::bit_cast as…
rniwa Apr 30, 2025
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2 changes: 1 addition & 1 deletion clang/lib/StaticAnalyzer/Checkers/WebKit/PtrTypesSemantics.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -462,7 +462,7 @@ bool isPtrConversion(const FunctionDecl *F) {
const auto FunctionName = safeGetName(F);
if (FunctionName == "getPtr" || FunctionName == "WeakPtr" ||
FunctionName == "dynamicDowncast" || FunctionName == "downcast" ||
FunctionName == "checkedDowncast" ||
FunctionName == "checkedDowncast" || FunctionName == "bit_cast" ||
FunctionName == "uncheckedDowncast" || FunctionName == "bitwise_cast" ||
FunctionName == "bridge_cast" || FunctionName == "bridge_id_cast" ||
FunctionName == "dynamic_cf_cast" || FunctionName == "checked_cf_cast" ||
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8 changes: 4 additions & 4 deletions clang/test/Analysis/Checkers/WebKit/call-args-checked-ptr.cpp
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Expand Up @@ -173,14 +173,14 @@ namespace param_formarding_function {

namespace casts {

CheckedObj* downcast(CheckedObj*) { return nullptr; }

template<class T>
T* bitwise_cast(T*) { return nullptr; }
CheckedObj* downcast(CheckedObj*);
template<class T> T* bitwise_cast(T*);
template<class T> T* bit_cast(T*);

void foo(CheckedObj* param) {
consume_ref_countable_ptr(downcast(param));
consume_ref_countable_ptr(bitwise_cast(param));
consume_ref_countable_ptr(bit_cast(param));
}
}
}
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18 changes: 9 additions & 9 deletions clang/test/Analysis/Checkers/WebKit/call-args.cpp
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Expand Up @@ -173,15 +173,15 @@ namespace param_formarding_function {

namespace casts {

RefCountable* downcast(RefCountable*) { return nullptr; }

template<class T>
T* bitwise_cast(T*) { return nullptr; }

void foo(RefCountable* param) {
consume_ref_countable_ptr(downcast(param));
consume_ref_countable_ptr(bitwise_cast(param));
}
RefCountable* downcast(RefCountable*);
template<class T> T* bitwise_cast(T*);
template<class T> T* bit_cast(T*);

void foo(RefCountable* param) {
consume_ref_countable_ptr(downcast(param));
consume_ref_countable_ptr(bitwise_cast(param));
consume_ref_countable_ptr(bit_cast(param));
}
}
}

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5 changes: 5 additions & 0 deletions clang/test/Analysis/Checkers/WebKit/uncounted-obj-arg.cpp
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Expand Up @@ -77,6 +77,9 @@ T&& forward(T& arg);
template<typename T>
T&& move( T&& t );

template<typename ToType, typename FromType>
ToType bit_cast(FromType from);

#define offsetof(t, d) __builtin_offsetof(t, d)

} // namespace std
Expand Down Expand Up @@ -386,6 +389,7 @@ class RefCounted {
void trivial68() { point pt = { 1.0 }; }
unsigned trivial69() { return offsetof(OtherObj, children); }
DerivedNumber* trivial70() { [[clang::suppress]] return static_cast<DerivedNumber*>(number); }
unsigned trivial71() { return std::bit_cast<unsigned>(nullptr); }

static RefCounted& singleton() {
static RefCounted s_RefCounted;
Expand Down Expand Up @@ -577,6 +581,7 @@ class UnrelatedClass {
getFieldTrivial().trivial68(); // no-warning
getFieldTrivial().trivial69(); // no-warning
getFieldTrivial().trivial70(); // no-warning
getFieldTrivial().trivial71(); // no-warning

RefCounted::singleton().trivial18(); // no-warning
RefCounted::singleton().someFunction(); // no-warning
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